Development of a Brazilian maize core collection

Genetics and Molecular Biology

Ronaldo R. Coimbra²  Glauco V. Miranda¹  Cosme D. Cruz¹  Derly J.h. Silva¹  Ramiro A. Vilela¹ 

[1] ,Universidade Federal do Tocantins Centro Universitário de Porto Nacional Porto Nacional TO ,Brazil

关键词: germplasm collection;    Zea mays;    breeding;    landraces;    selection;   

DOI  :  10.1590/S1415-47572009005000059

来源: SciELO

【 摘 要 】

The aim of this study was to evaluate methods for developing a Brazilian maize core collection. For an initial survey of the active collection, passport information, as well as characterization and evaluation of accessions, were taken into consideration, these then being divided according to geographic region and kernel-type. Multiple sampling methods were evaluated. The strategy of constant sampling generated extensive alterations in extract accession frequency. The multivariate strategy with dispersion graphs and principal components associated with the Tocher method was considered efficient for identifying the most divergent genotypes. The multivariate strategy generated greater alterations in the variance of traits. The average number of traits revealed few modifications with the various sampling strategies used. Therefore, the active collection could be considered as possessing a satisfactory amount of information for most of its accessions. Moreover, the multivariate strategy generated modifications in the variance of the traits, independent of sampling intensity.

【 授权许可】

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